/**
 * TreeView Chart Component - 100% INDEPENDENT
 * ============================================
 * Area 3: Trend Graph
 * Displays: Time-series trend chart using Plotly
 * 
 * Component Purpose: Visual trend analysis of historic data
 * Created: 2024-12-26
 * Version: 1.0
 */

/* COMPONENT ISOLATION CONTAINER */
.treeview-chart-root {
    /* CSS Container Isolation */
    isolation: isolate;
    contain: layout style;
    
    /* Base styles */
    font-family: 'Inter', system-ui, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #374151;
    box-sizing: border-box;
    
    /* Layout */
    position: relative;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background: #FFFFFF;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Ensure all child elements use component scoping */
.treeview-chart-root *,
.treeview-chart-root *::before,
.treeview-chart-root *::after {
    box-sizing: border-box;
}

/* Component Variables */
.treeview-chart-root {
    /* Colors */
    --chart-primary: #2563EB;
    --chart-gray-50: #F9FAFB;
    --chart-gray-100: #F3F4F6;
    --chart-gray-200: #E5E7EB;
    --chart-gray-300: #D1D5DB;
    --chart-gray-500: #6B7280;
    --chart-gray-600: #4B5563;
    --chart-gray-700: #374151;
    --chart-gray-800: #1F2937;
    --chart-white: #FFFFFF;
    
    /* Spacing */
    --chart-spacing-xs: 0.25rem;
    --chart-spacing-sm: 0.5rem;
    --chart-spacing-md: 0.75rem;
    --chart-spacing-lg: 1rem;
    
    /* Transitions */
    --chart-transition-fast: 0.15s ease-in-out;
}

/* ============================================
   HEADER
   ============================================ */

.treeview-chart-root .chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--chart-spacing-lg);
    background: linear-gradient(135deg, var(--chart-gray-50) 0%, var(--chart-gray-100) 100%);
    border-bottom: 1px solid var(--chart-gray-200);
    flex-shrink: 0;
}

.treeview-chart-root .chart-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--chart-gray-800);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--chart-spacing-sm);
}

.treeview-chart-root .chart-title i {
    color: var(--chart-primary);
    font-size: 1.1rem;
}

.treeview-chart-root .chart-info {
    font-size: 0.75rem;
    color: var(--chart-gray-600);
    margin-left: var(--chart-spacing-sm);
}

.treeview-chart-root .chart-actions {
    display: flex;
    gap: var(--chart-spacing-sm);
}

.treeview-chart-root .chart-btn {
    padding: var(--chart-spacing-xs) var(--chart-spacing-sm);
    background: var(--chart-white);
    border: 1px solid var(--chart-gray-300);
    border-radius: 4px;
    color: var(--chart-gray-600);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--chart-transition-fast);
    display: flex;
    align-items: center;
    gap: var(--chart-spacing-xs);
}

.treeview-chart-root .chart-btn:hover {
    background: var(--chart-primary);
    color: var(--chart-white);
    border-color: var(--chart-primary);
}

.treeview-chart-root .chart-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   CHART CONTAINER
   ============================================ */

.treeview-chart-root .chart-canvas-wrapper {
    flex: 1;
    padding: var(--chart-spacing-lg);
    position: relative;
    min-height: 0; /* Critical for flex scroll */
    overflow: auto; /* Enable scrolling if chart is large */
}

.treeview-chart-root .chart-canvas {
    width: 100%;
    height: 100%;
    min-height: 280px;
}

/* ============================================
   EMPTY STATE
   ============================================ */

.treeview-chart-root .chart-empty {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--chart-gray-500);
}

.treeview-chart-root .chart-empty i {
    font-size: 3rem;
    color: var(--chart-gray-300);
    margin-bottom: var(--chart-spacing-md);
}

.treeview-chart-root .chart-empty-text {
    font-size: 0.875rem;
    color: var(--chart-gray-600);
}

/* ============================================
   LOADING STATE
   ============================================ */

.treeview-chart-root .chart-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.treeview-chart-root .chart-loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--chart-gray-200);
    border-top: 3px solid var(--chart-primary);
    border-radius: 50%;
    animation: chart-spin 1s linear infinite;
}

@keyframes chart-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.treeview-chart-root .chart-loading-text {
    margin-top: var(--chart-spacing-md);
    font-size: 0.875rem;
    color: var(--chart-gray-600);
}

/* ============================================
   CHART CONTROLS
   ============================================ */

.treeview-chart-root .chart-controls {
    display: flex;
    align-items: center;
    gap: var(--chart-spacing-md);
    padding: var(--chart-spacing-md) var(--chart-spacing-lg);
    background: var(--chart-gray-50);
    border-top: 1px solid var(--chart-gray-200);
    flex-shrink: 0;
}

.treeview-chart-root .chart-control-group {
    display: flex;
    align-items: center;
    gap: var(--chart-spacing-sm);
}

.treeview-chart-root .chart-control-label {
    font-size: 0.75rem;
    color: var(--chart-gray-700);
    font-weight: 500;
}

.treeview-chart-root .chart-control-select {
    padding: var(--chart-spacing-xs) var(--chart-spacing-sm);
    border: 1px solid var(--chart-gray-300);
    border-radius: 4px;
    background: var(--chart-white);
    color: var(--chart-gray-700);
    font-size: 0.75rem;
    cursor: pointer;
    transition: border-color var(--chart-transition-fast);
}

.treeview-chart-root .chart-control-select:hover {
    border-color: var(--chart-primary);
}

.treeview-chart-root .chart-control-select:focus {
    outline: none;
    border-color: var(--chart-primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* ============================================
   STATISTICS PANEL
   ============================================ */

.treeview-chart-root .chart-stats {
    display: flex;
    gap: var(--chart-spacing-lg);
    padding: var(--chart-spacing-md) var(--chart-spacing-lg);
    background: var(--chart-gray-50);
    border-top: 1px solid var(--chart-gray-200);
    flex-shrink: 0;
}

.treeview-chart-root .chart-stat-item {
    display: flex;
    flex-direction: column;
    gap: var(--chart-spacing-xs);
}

.treeview-chart-root .chart-stat-label {
    font-size: 0.7rem;
    color: var(--chart-gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.treeview-chart-root .chart-stat-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--chart-gray-800);
}

.treeview-chart-root .chart-stat-value.positive {
    color: #10B981;
}

.treeview-chart-root .chart-stat-value.negative {
    color: #EF4444;
}

/* Warning and Danger threshold styling */
.treeview-chart-root .chart-stat-warning .chart-stat-value {
    color: #F59E0B;
    font-weight: 700;
}

.treeview-chart-root .chart-stat-warning .chart-stat-label {
    color: #D97706;
}

.treeview-chart-root .chart-stat-danger .chart-stat-value {
    color: #EF4444;
    font-weight: 700;
}

.treeview-chart-root .chart-stat-danger .chart-stat-label {
    color: #DC2626;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    .treeview-chart-root .chart-header {
        padding: var(--chart-spacing-md);
        flex-direction: column;
        align-items: flex-start;
        gap: var(--chart-spacing-sm);
    }
    
    .treeview-chart-root .chart-title {
        font-size: 0.9rem;
    }
    
    .treeview-chart-root .chart-canvas-wrapper {
        padding: var(--chart-spacing-md);
        min-height: 300px;
    }
    
    .treeview-chart-root .chart-canvas {
        min-height: 280px;
    }
    
    .treeview-chart-root .chart-controls {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .treeview-chart-root .chart-stats {
        flex-wrap: wrap;
        gap: var(--chart-spacing-md);
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    .treeview-chart-root * {
        transition: none !important;
        animation: none !important;
    }
}

/* ============================================
   PLOTLY OVERRIDES (Scoped)
   ============================================ */

.treeview-chart-root .chart-canvas .main-svg {
    background: transparent !important;
}

.treeview-chart-root .chart-canvas .modebar {
    top: 10px !important;
    right: 10px !important;
}

.treeview-chart-root .chart-canvas .modebar-btn {
    color: var(--chart-gray-600) !important;
}

.treeview-chart-root .chart-canvas .modebar-btn:hover {
    background: var(--chart-gray-100) !important;
    color: var(--chart-primary) !important;
}